What to do if Light switch has two black wires ?

If you’re faced with a light switch with two black wires, it’s likely that the switch is controlling a ceiling fan and light combination. In this case, you’ll want to connect the black wires to the brass screws on the switch. If the switch has two brass screws, you’ll want to connect one black wire to each screw. If the switch only has one brass screw, connect both black wires to the screw.

1) Troubleshooting

If you have a light switch with two black wires, it is most likely a three-way switch. Three-way switches are used to control lights from two different locations. The two black wires are the travelers, and the other wire is the common. To wire a three-way switch, you will need to connect the common wire to one of the traveler wires, and the other traveler wire to the other switch.
What to do if Light switch has two black wires ?

2) Electrical Basics

If you have two black wires in your light switch, it is most likely that one is a hot wire and the other is a ground wire. The hot wire is the one that provides power to the switch, and the ground wire is there for safety in case of an electrical short. To wire the switch, simply connect the hot wire to the brass terminal screw, and the ground wire to the green terminal screw.
2) Electrical Basics

3) Identifying Wires

If your light switch has two black wires, it is most likely a single-pole switch. This type of switch controls one light or fixture from one location. The two black wires are the live wires and are usually connected to the brass screws. The other wire, which may be black or white, is the neutral wire and is connected to the silver screw.
3) Identifying Wires

4) Connecting Wires

If you have two black wires in your light switch, it is most likely that one is the “hot” wire and the other is the “neutral” wire. The hot wire is the one that provides electricity to the switch and the light, while the neutral wire returns the electricity back to the power source. To wire the switch, you will need to connect the hot wire to one of the terminals on the switch, and the neutral wire to the other terminal.
4) Connecting Wires

5) Testing

If you have two black wires in your light switch, it is most likely that one is the power wire and the other is the ground wire. To test which is which, you can use a multimeter to test for continuity. The power wire will have continuity with the black wire from the light fixture. The ground wire will have continuity with the green wire from the light fixture. If you are not sure which wire is which, you can always consult a wiring diagram for your specific light switch.
5) Testing

6) Repairing

There are a few things that you can do if you have two black wires in your light switch. The first thing that you can do is to check the voltage with a multimeter to see if there is power going to the switch. If there is power going to the switch, then you can use a wire stripper to strip the insulation off of the wires. Once you have stripped the insulation off of the wires, you can use a wire nut to twist the wires together. If there is no power going to the switch, then you can use a wire nut to twist the wires together.
6) Repairing

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